In chess , the Cambridge Springs Defense (or less commonly, the Pillsbury Variation ) is a variation of the Queen's Gambit Declined that begins with the moves:
2-569: Black breaks the pin on the h4–d8 diagonal and forms a pin of their own on the c3-knight (exploiting the absence of the White's queen bishop from the queenside ). If Black later plays dxc4, there may be threats against the g5-bishop. Note that 5.cxd5 cannot win a pawn because of the Elephant Trap . The main line continues 7.Nd2 Bb4 with the threat of ...Ne4 and pressure along the a5–e1 diagonal. The Encyclopaedia of Chess Openings code
4-696: Is D52. The first recorded use of the Cambridge Springs was by Emanuel Lasker in 1892. The name derives from a 1904 tournament in Cambridge Springs , Pennsylvania , in which the defense was used several times. Practitioners of the opening have included Efim Bogoljubov , Vasily Smyslov , Garry Kasparov , and Magnus Carlsen . The line remains popular among amateurs because there are several traps White must avoid. For example, 7.Nd2 Bb4 8.Qc2 0-0 9.Bd3?? dxc4! (threatening ...Qxg5) 10.Bxf6 cxd3! (a zwischenzug ) 11.Qxd3 Nxf6 and Black has won
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